  H("=== MACROS ===","");
  H("`",      "macro and repeat prefix");
  H("--- syntax ---","");
  H("`A@@@@`","define macro A, @@@@ = max 32 keys (not mouse)");
  H("",       "26 macros A..Z are available");
  H("`A`",    "erase macro A (=replace by empty string)");
  H("`Ctrl-A","print macro to stderr (simple)");
  H("`a",     "execute macro A");
  H("`####@", "repeat character @ ####-times (max 9999)");
  H("`####`a","repeat macro A ####-times");
  H("`/",     "swap mid <-> right mouse button (useful without mouse)");
  H("ESC",    "interrupt running macro");
